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Ball bearings are types of bearings in the family of rolling-element bearings. These bearings utilize balls to separate the bearing races. The principle behind the setup is that rolling works better than sliding. This is because sliding causes a lot of friction that can slow down your power transmission system.

The ball bearing cuts rotation friction but supports axial and radial loads. To achieve this, the bearing relies on three races that do two tasks: one, contain the balls, two, transmit the load. Besides, one of the races is fixed while the other moves together with the rotating part (shaft or hub).

When the bearing starts rotating, it also rotates the balls. With the two moving in the same direction, the friction is lower than if the surfaces were sliding. Another advantage of the ball bearings is that they can tolerate some misalignment.

However, it is important to note that the ball bearings support lower load capacity when compared to bearings in other categories. This is because the surface area of contact between races and balls is reduced.

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